Stacked-type heat dissipating apparatus

ABSTRACT

A stacked-type heat dissipating apparatus of the present invention includes at least one layer of heat dissipating plate stacked upon a heat guiding plate. The heat dissipating plate has a plurality of strip-shaped projections formed therein to provide a separation space between at least one layer of heat dissipating plate and the heat guiding plate. Each of the strip-shaped projections having two ends respectively formed a first pierced edge in a punch press for providing an air guide channel. Whereby the present invention has a high stacking density at small volume integrally and to assemble easily, further to provide a large porosity, to reduce hydraulic resistance and hydraulic noise.

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This Application is a Continuation-in-Part of application Ser. No. 09/576868, filed May 22, 2000, and entitled STACKED-TYPE HEAT DISSIPATING APPARATUS.

BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to a stacked-type heat dissipating apparatus. More particularly, the present invention is directed to multi-layers of heat dissipating plates that are adapted to a central processor.

[0004] 2. Description of the Related Art

[0005] Conventional heat dissipating apparatus for a central processor can be classified to an aluminum extruded type heat dissipating fin, a heat pipe type heat dissipating device and a multi-layers type heat dissipating assembly. FIGS. 12 and 13 show a conventional heat dissipating assembly comprising a bottom plate 11, a top plate 12 and a plurality of heat dissipating plates 13. A gap 16 of predetermined height is formed between the top plate 12 and the adjacent heat dissipating plate 13, between the bottom plate 11 and the adjacent heat dissipating plate 13, and between two adjacent heat dissipating plates 13. A plurality of fan mounting openings 17 are formed on corresponding positions of the bottom plate 11, the top plate 12 and the plurality of heat dissipating plates 13 such that the gaps 16 are communicated with the fan mounting openings 17. A plurality of heat conducting ribs 14 and 15 are formed between the top plate 12 and the adjacent heat dissipating plate 13, between the bottom plate 11 and the adjacent heat dissipating plate 13 and between two adjacent heat dissipating plates 13. In other word, the heat conducting ribs 14 and 15 are located within the gap 16 and extended with the fan mounting opening 17 due to a fan 19 as center. The heat conducting ribs 14 and 15 are of flat plate shape and assembled integrally with the heat dissipating plates 13. The heat conducting ribs 14 and 15 have fusiform lateral sides assembled to the heat dissipating plates 13 by rivet 18.

[0006] However, the conducting ribs 14 and 15 occupy considerable area such that wake of the air flow will be formed on comer of the conducting ribs 14 and 15. Even though the conducting ribs 14 and 15 are bent for guiding the wake, the problem is not solved. The heat conducting ribs 14 and 15 are assembled to the heat dissipating plates 13 by rivet 18, that the process is cumbersome. Moreover, the wake induced by the heat conducting ribs 14 and 15 generates noise.

SUMMARY OF THE INVENTION

[0007] The primary purpose of the present invention is to provide a stacked-type heat dissipating apparatus, which has multi-layers of heat dissipating plates for a high stacking density at small volume integrally and to assemble easily.

[0008] Another purpose of the present invention is to provide a stacked-type heat dissipating apparatus having a plurality of strip-shaped projections each formed different shape for guiding the air flow, and reducing hydraulic resistance and hydraulic noise.

[0009] A further purpose of the present invention is to provide a stacked-type heat dissipating apparatus formed pierced edges in a punch press, thereby to provide a large porosity for reducing the hydraulic resistance and accelerating the heat transfer.

[0010] Accordingly, the stacked-type heat dissipating apparatus of the present invention includes at least one layer of heat dissipating plate stacked upon a heat guiding plate. The heat dissipating plate has a plurality of strip-shaped projections formed therein to provide a separation space (or gap) between at least one layer of heat dissipating plate and the heat guiding plate. An air inlet is defined by an opening formed in at least one layer of heat dissipating plate in correspondence with one another. And each of the strip-shaped projections have two ends respectively formed a first pierced edge in a punch press for providing an air guide channel. Whereby, an air flow is guided from the air inlet to flow through the separation space and the air guide channel between at least one layer of heat dissipating plate and the heat guiding plate.

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiments with reference to the accompanying drawings, in which:

[0012]FIG. 1 is a perspective view of the present invention;

[0013]FIG. 2 is an exploded view of the present invention (dot-shaped projections);

[0014]FIG. 3 is a sectional view of the present invention (phantom line showing the fan);

[0015]FIG. 4 is a top view of the present invention (arrow showing the air moving direction);

[0016]FIG. 5 is a top view of the second preferred embodiment of the present invention;

[0017]FIG. 6 is an exploded view of the third preferred embodiment of the present invention (strip-shaped projections);

[0018]FIG. 7 is a perspective view of the fourth preferred embodiment of the present invention;

[0019]FIG. 8 is a perspective view of the fifth preferred embodiment of the present invention;

[0020]FIG. 9 is a perspective view of the sixth preferred embodiment of the present invention;

[0021]FIG. 10 shows another stacking manner of the present invention;

[0022]FIG. 11 shows still another stacking manner of the present invention;

[0023]FIG. 12 is a perspective view of prior art heat dissipating apparatus;

[0024]FIG. 13 is an exploded view of prior art heat dissipating apparatus;

[0025]FIG. 14 is an exploded view of the seventh preferred embodiment of the present invention;

[0026]FIG. 14A is a sectional view taken along line A-A in FIG. 14;

[0027]FIG. 14B is a sectional view taken along line B-B in FIG. 14; and

[0028]FIG. 14C is a sectional view taken along line C-C in FIG. 14.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0029] With reference now to FIGS. 1-5 and 9-11, the present invention is intended to provide a stacked-type heat dissipating apparatus. The stacked-type heat dissipating apparatus comprises at least one heat dissipating plate 2 and a plurality of dot-shaped projections 20 integrally formed with the heat dissipating plate 2 to support the heat dissipating plate 2 over adjacent heat dissipating plate 2. As shown in FIGS. 10 and 11, the position of the dot-shaped projections 20 of the heat dissipating plates 2 can be the same or be different as shown in FIG. 3 to facilitate stacking. Each heat dissipating plate 2 has an air inlet 22 at same location, for example, at center or at off-center location. A cooling fan 25 is arranged corresponding to the air inlet 22. The cooling fan 25 can be arranged atop the air inlet 22 or within the air inlet 22. The cooling fan 25 can be hung at topside as shown in FIG. 3 or at bottom side as shown in FIG. 1 or fixed to any heat dissipating plate 2. The dot-shaped projections 20 can be such arranged that the air led in from the air inlet 22 is guided to the gap formed between the heat dissipating plates 2 to provide better heat dissipating effect and reduce height of the heat dissipating apparatus.

[0030] As shown in FIG. 2, the dot-shaped projections 20 can provide support between a upper and a lower heat dissipating plates 2, or provide air guide, or provide heat conducting interface. The dot-shaped projections 20 according to the present invention have four to eight rows of dots, as shown in FIG. 5, the dot-shaped projections 20 according to the present invention have sixteen rows of dots, all are preferred embodiments of the present invention. The dot-shaped projections 20 are formed by integrally punch pressing on the heat dissipating plates 2. The sizes of the dot-shaped projections 20 are compact and wake of the air flow is hard to form near the air inlet 22. The hydraulic resistance is reduced and the heat transfer efficiency is enhanced. As shown in FIG. 3, the height of the dot-shaped projection 20 is equal to the gap, and the projections 20 should be staggered to each other. As shown in FIGS. 10 and 11, the height of the projection 20 is larger than the gap, and the dot-shaped projections 20 do not require being staggered to each other. As shown in FIG. 10, the height of the dot-shaped projection 20 is greatly larger than the gap. As shown in FIG. 11, the height of the dot-shaped projection 20 is equal to the gap plus plate height.

[0031] Furthermore, please refer to FIGS. 6, 7, 8, 14, 14A, 14B and 14C, the stacked-type heat dissipating apparatus comprises at least one layer of heat dissipating plate 2, a heat guiding plate 4 and a cooling fan 25, wherein:

[0032] At least two layers of heat dissipating plates 2 are stacked one upon the other, and a lowest heat dissipating plate 2 is stacked upon the heat guiding plate 4. The heat dissipating plate 2 has a plurality of strip-shaped projections 23, 26, 27, 28 formed therein to provide a separation space (or gap) between at least one layer of heat dissipating plate 2 and the heat guiding plate 4, and the air inlet 22 is defined by an opening formed in each heat dissipating plate 2 in correspondence with one another. The cooling fan can be disposed in corresponding to the air inlet 22. And the strip-shaped projections 23, 26, 27, 28 integrally have a tangential shape 23 or a radiated shape 26 or a voluted shape 27 or a concentric shape 28 relative to the air inlet 22 for guiding the air flow and reducing hydraulic resistance.

[0033] Please refer to FIG. 14B, the strip-shaped projections 23, 26, 27, 28 each have two ends respectively formed a first pierced edge 230 in punch press to provide an air guide channel 260 therebetween (show in FIG. 14A), so that the air flow can flow through the air guide channel 260 longitudinally to exit or upwardly between at least two layers of heat dissipating plates 2, thereby be able to reduce the hydraulic resistance and to accelerate the heat transfer, another, the strip-shaped projections 23, 26, 27, 28 each has a longitudinally side formed a second pierced edge 261. Whereby an air flow is guided from the air inlet 22 to flow through the separation space and the air guide channel 260 between at least one layer of heat dissipating plate 2 and the heat guiding plate 4.

[0034] The heat dissipating plate 2 has a plurality of folded corner portions 21 for joining at least one layer of heat dissipating plate together by a process selected from the group consisting of welding, brazing, soldering, sintering, and gluing. The folded corner portions 21 are longer than the projections 20, whereby an upper heat dissipating plate 2 is stacked on a lower heat dissipating plate 2. By the folded corner portions 21, the dissipating plate 2 can be easily stacked without shift. Another, the heat dissipating plate 2 has at least a lateral side extended a folded side portion 21′ for decreasing thermal resistance.

[0035] The heat guiding plate 4 is contacted to a heat source (such as a central processor), and the heat guiding plate 4 has at least one upward folded plate 43, the upward folded plate 43 contacted to a lateral side of at least one layer of the heat dissipating plate 2, so as to limit an air outlet direction and also to reduce the thermal resistance between the heat guiding plate 4 and at least one layer of heat dissipating plate 2.

[0036] Moreover, as shown in FIG. 7, the heat guiding plate 4 can be a lowest heat dissipating plate 2 having an upward folded plate 41 to seal the partial lateral side of at least one layer of heat dissipating plate 2 and limit the air outlet direction. As shown in FIG. 8, a cooling fan 25 is disposed at off-center location of the heat dissipating plate 2, the three lateral surfaces of the stacked-type heat dissipating apparatus are sealed by the upward folded plates 42, 43 and 44 extended from a topmost or lowest heat dissipating plate 2 to expose only one lateral side of the stacked-type heat dissipating apparatus. The upward folded plates 42, 43 and 44 are contacted to the heat dissipating plate 2 for enhancing heat dissipating effect.

[0037] To sum up, it can be seen that the present invention provides multi-layers of heat dissipating plates having a plurality of strip-shaped projections with pierced edges, which has a high stacking density at small volume integrally and to assemble easily, further to provide a large porosity, to reduce hydraulic resistance and hydraulic noise.

[0038] While the present invention has been described with reference to a specific embodiment, the description is illustrative of the invention and is not to be construed as limiting the invention.

[0039] Therefore, various modifications to the present invention can be made to the preferred embodiment by those skilled in the art without departing from the true spirit and scope of the invention as defined by the appended claims. 

What is claimed is:
 1. A stacked-type heat dissipating apparatus, comprising: at least one layer of heat dissipating plate stacked upon a heat guiding plate, the heat dissipating plate having a plurality of strip-shaped projections formed therein to provide a separation space between at least one layer of heat dissipating plate and the heat guiding plate; an air inlet defined by an opening formed in at least one layer of heat dissipating plate in correspondence with one another; and each of the strip-shaped projections having two ends respectively formed a first pierced edge in a punch press for providing an air guide channel; whereby, an air flow is guided from the air inlet to flow through the separation space and the air guide channel between at least one layer of heat dissipating plate and the heat guiding plate.
 2. The stacked-type heat dissipating apparatus as in claim 1, further comprising a cooling fan is disposed in corresponding to the air inlet.
 3. The stacked-type heat dissipating apparatus as in claim 1, wherein the strip-shaped projections each have a longitudinally side formed a second pierced edge.
 4. The stacked-type heat dissipating apparatus as in claim 1, wherein the strip-shaped projections integrally have a tangential shape or a radiated shape or a voluted shape or a concentric shape relative to the air inlet of the heat dissipating plate .
 5. The stacked-type heat dissipating apparatus as in claim 1, wherein the heat dissipating plate has a plurality of folded corner portions for joining at least one layer of heat dissipating plate together.
 6. The stacked-type heat dissipating apparatus as in claim 1, wherein the heat dissipating plate has at least a lateral side extended a folded side portion for decreasing thermal resistance.
 7. The stacked-type heat dissipating apparatus as in claim 1, wherein the heat guiding plate is a lowest heat dissipating plate contacted to a heat source.
 8. The stacked-type heat dissipating apparatus as in claim 7, wherein the heat guiding plate has at least one upward folded plate, the upward folded plate contacted in corresponding to at least one lateral side of at least one layer of heat dissipating plate, so as to limit an air outlet direction and also to reduce the thermal resistance between the heat guiding plate and at least one layer of heat dissipating plate. 